/**
 *    Copyright (C) 2019-present MongoDB, Inc.
 *
 *    This program is free software: you can redistribute it and/or modify
 *    it under the terms of the Server Side Public License, version 1,
 *    as published by MongoDB, Inc.
 *
 *    This program is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *    Server Side Public License for more details.
 *
 *    You should have received a copy of the Server Side Public License
 *    along with this program. If not, see
 *    <http://www.mongodb.com/licensing/server-side-public-license>.
 *
 *    As a special exception, the copyright holders give permission to link the
 *    code of portions of this program with the OpenSSL library under certain
 *    conditions as described in each individual source file and distribute
 *    linked combinations including the program with the OpenSSL library. You
 *    must comply with the Server Side Public License in all respects for
 *    all of the code used other than as permitted herein. If you modify file(s)
 *    with this exception, you may extend this exception to your version of the
 *    file(s), but you are not obligated to do so. If you do not wish to do so,
 *    delete this exception statement from your version. If you delete this
 *    exception statement from all source files in the program, then also delete
 *    it in the license file.
 */

#include "mongo/s/read_write_concern_defaults_cache_lookup_mongos.h"

#include "mongo/client/read_preference.h"
#include "mongo/db/commands/rwc_defaults_commands_gen.h"
#include "mongo/db/database_name.h"
#include "mongo/db/sharding_environment/client/shard.h"
#include "mongo/db/sharding_environment/grid.h"
#include "mongo/db/topology/shard_registry.h"
#include "mongo/idl/idl_parser.h"
#include "mongo/util/assert_util.h"

#include <memory>

#include <boost/move/utility_core.hpp>
#include <boost/optional/optional.hpp>

namespace mongo {

boost::optional<RWConcernDefault> readWriteConcernDefaultsCacheLookupMongoS(
    OperationContext* opCtx) {
    GetDefaultRWConcern configsvrRequest;
    configsvrRequest.setDbName(DatabaseName::kAdmin);

    auto configShard = Grid::get(opCtx)->shardRegistry()->getConfigShard();
    auto cmdResponse =
        uassertStatusOK(configShard->runCommand(opCtx,
                                                ReadPreferenceSetting(ReadPreference::Nearest),
                                                DatabaseName::kAdmin,
                                                configsvrRequest.toBSON(),
                                                Shard::RetryPolicy::kIdempotent));

    uassertStatusOK(cmdResponse.commandStatus);

    return RWConcernDefault::parse(cmdResponse.response,
                                   IDLParserContext("readWriteConcernDefaultsCacheLookupMongoS"));
}

}  // namespace mongo
